From the thread on Beginner Triathlete, it sounds like there's a problem with the quick release. I suspect if you left it on the original strap, it would be fine. However, the quick release (to let you mount it on your bike from wrist) sounds like it's a bad design.
Whoops - Slowtwitch - not BT. Thread here




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Funny, both pieces were just delivered so I'll be playing with them this afternoon. 

